Contents  on 24 June '09


The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection. - Note: A/CC has a main Web site and also a backup site with its own duplicate RSS news feed.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. And use the all-up news archive to access news from any time since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.

NEOCP Activity  on 24 June '09

The MPC's NEO Confirmation Page has 4 listings: 1 new, 3 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and three updated listings. All of these were "one nighters." So far The Tracking News has counted a total of eight listings on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 24 June '09

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2009-M34 - "21:07 UT" - 2005 UN524 = 2003 YW292

MPEC 2009-M33 - "19:10 UT" - 2009 MM1

MPEC 2009-M32 - "15:28 UT" - 2009 ML1

<< DOU on 24 June '09 >>  MPEC 2009-M31 - "06:06 UT" - Daily Orbit Update

Observers  on 24 June '09

Seventeen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 11 in MPECs 2009-M31 & 2009-M32 -- 2009 MW, 2009 MU, 2009 MS, 2009 ML1, 2009 LV2, 2009 LS, 2009 ED1, 2009 BL2, 2001 SE286, 2001 FA1, 1999 TC5
J51Atlante Obs. in the Canary Islands, 3 in MPEC 2009-M31 -- 2009 KD5, 2002 LV, 5620
703Catalina Sky Survey in Arizona, 1 in MPEC 2009-M31 -- 213869
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 2 in MPEC 2009-M31 -- 2009 MU, 2001 FE90
J27El Guijo Obs. in Spain, 1 in MPEC 2009-M31 -- 15745
J95Great Shefford Obs. in England, 2 in MPEC 2009-M31 -- 2009 MU, 2009 MS
J28Jaen Obs. in Spain, 3 in MPEC 2009-M31 -- 2001 HY7, 54401, 15745
704LINEAR in New Mexico, 1 in MPEC 2009-M31 -- 16834
J75La Sagra Obs. in Spain, 1 in MPEC 2009-M31 -- 2009 KD5
568Mauna Kea in Hawaii, 1 in MPEC 2009-M34 -- 2005 UN524
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2009-M31 & 2009-M32 -- 2009 ML1, 31345, 3908
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 3 in MPEC 2009-M31 -- 2009 MA, 2009 KL2, 2002 LV
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPECs 2009-M31 & 2009-M33 -- 2009 MM1, 2009 LX, 2009 KN4, 25330
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2009-M31 -- 2000 KN44, 1999 VG22, 16960, 5626
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2009-M31 & 2009-M32 -- 2009 ML1, 2009 MG1, 2009 JR5
H53Thompsonville Obs. in Illinois, 1 in MPEC 2009-M31 -- 2002 LT38
J08Zonalunar Obs. in Spain, 1 in MPEC 2009-M31 -- 15745
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 June '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) risk pages.





Notes for Today's Latest Risk Assessments
2009 MG1JPL Sentry13302079-208332.6e-07-6.06-6.340JPL: "Analysis based on 15 observations spanning 2.9300 days (2009-Jun-21.27223 to 2009-Jun-24.20218)." Diameter approximately 0.056 km. from mean, weighted H=23.9.
NEODyS13302079-208342.56e-07-6.07-6.330NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2009/06/21.273 to 2009/06/24.203."
2009 MUJPL Sentry13302096-209921.8e-07-6.72-6.780JPL: "Analysis based on 87 observations spanning 4.7182 days (2009-Jun-19.30659 to 2009-Jun-24.024819)." Diameter approximately 0.042 km. from mean, weighted H=24.5.
2009 MSJPL Sentry1330203411.4e-10-4.55-4.550JPL: "Analysis based on 22 observations spanning 4.8134 days (2009-Jun-19.22249 to 2009-Jun-24.03593)." Diameter approximately 2.400 km. from mean, weighted H=15.8.
NEODyS1330R E M O V E D-

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology  on 24 June '09

Times are UTC for when items were noted or added by The Tracking News.

2309Grabbed MPEC 2009-M34 - 2005 UN524 = 2003 YW292 - see above
2001Grabbed MPEC 2009-M33 - 2009 MM1 - see above
1530Grabbed MPEC 2009-M32 - 2009 ML1 - see above
1330Noted that JPL Sentry has updated its 2009 MG1 risk assessment - see above
Noted that NEODyS has posted 2009 MG1 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 MS risk assessment - see above
Noted that NEODyS has removed 2009 MS as an impact risk - see above
Noted that JPL Sentry has updated its 2009 MU risk assessment - see above
Grabbed MPEC 2009-M31 - Daily Orbit Update - see above